Abilities, Illusion
2 species carry Illusion as a normal ability
Of the 1,025 species this site covers, default forms only
SinceGen V
Normal2
Hidden0
Elsewhere2
Effect, in PokéAPI's words
“Takes the appearance of the last conscious party Pokémon upon being sent out until hit by a damaging move.”
As a normal ability
Zorua
ZoroarkElsewhere in PokéAPI
2 more holders without a page here
Alternate forms and other species that PokéAPI lists with Illusion.
Zorua Hisui, Zoroark Hisui